EP0544911A4 - - Google Patents

Info

Publication number
EP0544911A4
EP0544911A4 EP19920905103 EP92905103A EP0544911A4 EP 0544911 A4 EP0544911 A4 EP 0544911A4 EP 19920905103 EP19920905103 EP 19920905103 EP 92905103 A EP92905103 A EP 92905103A EP 0544911 A4 EP0544911 A4 EP 0544911A4
Authority
EP
European Patent Office
Prior art keywords
low
flux
magnetic flux
frequency signal
signal components
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19920905103
Other versions
EP0544911B1 (en
EP0544911A1 (en
Inventor
Seigo Nkk Corporation Ando
Yasuhiro Nkk Corporation Matsufuji
Hiroshi Nkk Corporation Maki
Mamoru Nkk Corporation Inaba
Kenichi Nkk Corporation Iwanaga
Atsuhisa Nkk Corporation Takekoshi
Masaki Nkk Corporation Takenaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP3175488A external-priority patent/JP2526748B2/en
Application filed by NKK Corp filed Critical NKK Corp
Publication of EP0544911A1 publication Critical patent/EP0544911A1/en
Publication of EP0544911A4 publication Critical patent/EP0544911A4/en
Application granted granted Critical
Publication of EP0544911B1 publication Critical patent/EP0544911B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

A method of flux detection, in which a low-pass filter (107) picks up low-frequency signal components of an output signal (106) from a magnetic flux sensor (104) for detecting leakage flux caused by magnetically abnormal portion of a body (101) that is moving in a magnetic field, the low-frequency signal components are amplified and applied to a compensation coil (111), and stray flux intersecting the flux sensor (104) is cancelled by the magnetic flux generated by the compensation coil (111). A magnetic flux detector comprises a low-pass filter (107) which picks up low-frequency signal components of an output signal (106) from a magnetic flux sensor (104) for detecting leakage flux caused by magnetically abnormal portion of a body (101) that is moving in a magnetic field, an amplifier (110) for amplifying the low-frequency signal components picked up by the low-pass filter (107), and a compensation coil (111) which is excited by the output signal of the amplifier (110) and which generates a magnetic flux to cancel the stray flux originating from the body (101) and intersecting the magnetic flux sensor (104).
EP92905103A 1991-06-04 1992-02-24 Device for detecting magnetic flux Expired - Lifetime EP0544911B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP13291191 1991-06-04
JP132911/91 1991-06-04
JP3175488A JP2526748B2 (en) 1991-01-19 1991-07-16 Abnormal part detection device for metal band
JP175488/91 1991-07-16
WOPCT/JP91/01685 1991-12-03
PCT/JP1991/001685 WO1992021963A1 (en) 1991-06-04 1991-12-03 Method for sensing magnetism and device thereof
PCT/JP1992/000191 WO1992021964A1 (en) 1991-06-04 1992-02-24 Method and device for detecting magnetic flux

Publications (3)

Publication Number Publication Date
EP0544911A1 EP0544911A1 (en) 1993-06-09
EP0544911A4 true EP0544911A4 (en) 1994-02-16
EP0544911B1 EP0544911B1 (en) 1997-08-27

Family

ID=26467374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92905103A Expired - Lifetime EP0544911B1 (en) 1991-06-04 1992-02-24 Device for detecting magnetic flux

Country Status (3)

Country Link
EP (1) EP0544911B1 (en)
DE (1) DE69221829T2 (en)
WO (2) WO1992021963A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0801304B1 (en) * 1995-10-31 2001-10-10 Nkk Corporation Magnetic flaw detection apparatus
US5804964A (en) * 1996-11-29 1998-09-08 Noranda Inc. Wire rope damage index monitoring device
CN102495131B (en) * 2011-11-28 2015-03-04 中国石油集团川庆钻探工程有限公司 Device and method for detecting magnetic flux leakage of wellhead of drilling tool
CN109725052B (en) * 2019-01-31 2023-08-25 合肥中大检测技术有限公司 Support mechanism of magnetic sensor array and steel pipe longitudinal defect magnetic leakage detection device
JP7452883B2 (en) * 2019-08-06 2024-03-19 株式会社 Integral Geometry Science Storage battery inspection device and storage battery inspection method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5163666A (en) * 1974-11-29 1976-06-02 Mitsubishi Electric Corp JIKIHOSHOSOCHI
JPS61147158A (en) * 1984-12-21 1986-07-04 Nippon Steel Corp Defect detecting device for strip
JPH0430540Y2 (en) * 1985-01-11 1992-07-23
JPS61277051A (en) * 1985-05-31 1986-12-08 Sumitomo Metal Ind Ltd Apparatus for measuring magnetic characteristics
JPS6396547A (en) * 1986-10-14 1988-04-27 Nippon Steel Corp Detecting device for defect of band-shaped metallic plate
JPH0628690Y2 (en) * 1988-04-05 1994-08-03 新日本製鐵株式会社 Metal plate defect detector

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9221964A1 *

Also Published As

Publication number Publication date
WO1992021964A1 (en) 1992-12-10
EP0544911B1 (en) 1997-08-27
EP0544911A1 (en) 1993-06-09
DE69221829D1 (en) 1997-10-02
DE69221829T2 (en) 1998-04-09
WO1992021963A1 (en) 1992-12-10

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